total scattering and pair distribution function analysis in modelling disorder in pzn (pbzn1/3nb2/3o3)

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ID: 221772
2016
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Abstract
The ability of the pair distribution function (PDF) analysis of total scattering (TS) from a powder to determine the local ordering in ferroelectric PZN (PbZn1/3Nb2/3O3) has been explored by comparison with a model established using single-crystal diffuse scattering (SCDS). While X-ray PDF analysis is discussed, the focus is on neutron diffraction results because of the greater extent of the data and the sensitivity of the neutron to oxygen atoms, the behaviour of which is important in PZN. The PDF was shown to be sensitive to many effects not apparent in the average crystal structure, including variations in the B-site—O separation distances and the fact that 〈110〉 Pb2+ displacements are most likely. A qualitative comparison between SCDS and the PDF shows that some features apparent in SCDS were not apparent in the PDF. These tended to pertain to short-range correlations in the structure, rather than to interatomic separations. For example, in SCDS the short-range alternation of the B-site cations was quite apparent in diffuse scattering at (½ ½ ½), whereas it was not apparent in the PDF.
Reference Key
whitfield2016iucrjtotal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Ross E. Whitfield;Darren J. Goossens;T. Richard Welberry
Journal european journal of orthopaedic surgery & traumatology : orthopedie traumatologie
Year 2016
DOI
10.1107/S2052252515018722
URL
http://scripts.iucr.org/cgi-bin/paper?S2052252515018722
Keywords
single-crystal diffuse scatteringscience

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